---The manager finally agreed to our new marketing proposals.
---It never occurred to me you could succeed in persuading him to change his mind.
| A．which | B．what | C．that | D．if |
We had to wait half an hour _______ we already booked a table.
| A．since | B．although | C．until | D．before |
Help others whenever you can ______ you will make the world a nicer place to live in.
| A．and | B．or | C．unless | D．but |
Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
| A．why | B．how | C．unless | D．where |
___ the silence of the pauses, we could hear each other’s breathing and could almost hear our own heartbeats.
| A．In | B．For | C．Under | D．Between |
You will be successful in the interview ____ you have confidence.
| A．before | B．once | C．until | D．though |